[1] Shiga Univ Med Sci Hosp, Div Diagnost Pathol, Otsu, Shiga, Japan
[2] Oita Univ, Dept Gastroenterol, Fac Med, Oita, Japan
[3] Shiga Univ Med Sci, Dept Pathol, Div Pathol & Dis Regulat, Otsu, Shiga, Japan
[4] Shiga Univ Med Sci Hosp, Div Gastrointestinal Endoscopy, Otsu, Shiga, Japan
[5] Shiga Univ Med Sci Hosp, Dept Med, Otsu, Shiga, Japan